Update CONFIGURE_ARGS for how we pass CONFIGURE_TARGET to configure script.
Specifically, newer autoconf (> 2.13) has different semantic of the
configure target. In short, one should use --build=CONFIGURE_TARGET
instead of CONFIGURE_TARGET directly. Otherwise, you will get a warning
and the old semantic may be removed in later autoconf releases.
To workaround this issue, many ports hack the CONFIGURE_TARGET variable
so that it contains the ``--build='' prefix.
To solve this issue, under the fact that some ports still have
configure script generated by the old autoconf, we use runtime detection
in the do-configure target so that the proper argument can be used.
Changes to Mk/*:
- Add runtime detection magic in bsd.port.mk

Update the itcl/itk from 3.2 to 3.3 (released in April 2005). The
installed libraries are now named libitcl.so.3 & libitk.so.3 instead
of having the version be part of the libname (libitcl33.so.1). The
itclConfig.sh and itkConfig.sh are now also installed, which is required
by some software (such as the insight -- a gdb frontend).
Fix-up the (unchanged) iwidgets port to reflect the above and improve it
to not require its own copy of the itcl tree at install time.
Approved by: maintainer
Fix-up the tkdesk port to reflect the itcl/itk changes, which required
updating it to the 2.0p2 (from 2.0). (This lovely piece of software
badly needs a caring maintainer, BTW.) While here, teach tkdesk to use
installed blt instead of building its own.
The only iwidget/itk/itcl consumer that remains broken is net/smm++ (a
MUD client). This should change as soon as the maintainer get back to
me.

mat@FreeBSD.org reports no response from this maintainer for several
months about his other ports, so reset this one too. His last
approved update was several months ago.
Maintainer, if this is in error, please contact me directly.

make tkdesk not to depend on the ports version of the BLT library.
use the internal version instead.
this is a preparation for switching BLT to tcl/tk 8.4 since tkdesk is
also dependent on 8.3 through itcl.
OKed by the maintainer, Andy Sparrow <spadger@best.com>

- Use itcl as a dependency instead of itk. - Include extra patches from master
web site fixing various problems. - Use FreeBSD-specific utils (e.g. 'vipw'
instead of 'vi /etc/passwd') or correct non-FreeBSD flags to system programs
(e.g. 'du -D' will not work on FreeBSD).